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Developer Reference

Opinionated micro-docs. One right answer. Copy-paste ready.

Categories

Version control commands, workflows, and common fixes

Language features, patterns, and runtime behavior

Type system, compiler options, and type-level programming

Runtime APIs, module system, and server-side patterns

Components, hooks, state management, and rendering

Layout, selectors, responsive design, and visual effects

Linux & Shell 3

Command-line tools, scripting, and system administration

Recently Added

Array reduce: sum values and transform objects

JavaScript iterates an array and accumulates a single result. The key: always return the...

Undo the last commit but keep the changes

Git Reset the last commit while keeping all changes staged and ready to re-commit....

Fix "Cannot find module" with ES modules in Node.js

Node.js Node.js ES modules require explicit file extensions in import paths. Unlike...

Run a command on every file find matches

Linux & Shell To run a command on each file matches, use with as the placeholder and a...

Find files modified within a certain time range

Linux & Shell To find files by age, use 's flag. The sign works backwards from what feels...

Get the full (absolute) path of a file

Linux & Shell Resolve any relative path to its full, absolute path: Why , Not is the common...

List all git-ignored files and folders in a repo

Git Get a flat list of every file and folder git is currently ignoring: Why This...

A storage URL builder and its static file handler must share one prefix constant

Node.js When a storage abstraction returns URLs that the app's static-file handler is...

Content-hash dedup that restores a soft-deleted row must re-run quota and limit checks

Node.js Content-hash dedup is supposed to be free: same bytes, same row, no charge. If...

Serialize per-user check-then-write flows with pg_advisory_xact_lock(hashtext(id))

Node.js When the same user can race against themselves on a check-then-write flow...